WO2020220688A1 - White led lamp bead, light bar and light fixture - Google Patents

Abstract

A white LED lamp bead, a light bar and a light fixture. A relative spectrum of the white LED lamp bead is Ф(λ). A relative spectrum of black body radiation having the corresponding color temperature is S(λ). Area normalization is performed on Ф(λ) and S(λ) to convert the same to an equal energy spectrum Ф'(λ) of the white LED lamp bead and an equal energy spectrum S'(λ) of the black body radiation having the corresponding color temperature. R-squared (R) values of the equal energy spectrum of the white LED lamp bead and the equal energy spectrum of the black body radiation satisfy the following formula (I): when λi is 380 nm, λn is 680 nm, R ≥ 85％. The invention enables a low amplitude of fluctuation in spectra and excellent spectral continuity, such that a spectrum of a light fixture of the invention approximates to the spectrum of sunlight, thereby providing a user performing indoor activities with favorable illumination resembling an outdoor environment.

Description

White LED lamp bead, lamp bar and lamp

This application requires the application number 201910356846.1, the filing date is April 29, 2019, and the invention-creation title is "a white LED lamp bead, light bar and lamp" for the priority of the Chinese patent application.

Technical field

The present invention relates to the technical field of light emitting devices, in particular to a white LED lamp bead capable of emitting a spectrum similar to sunlight, and a light bar and a lamp using the LED lamp bead.

Background technique

As people's requirements for light quality increase, more and more applications place higher requirements on the light color of light-emitting devices. However, there is currently no uniform evaluation standard for solar-like lighting products on the market. Some products known as solar-like products make their spectrum as close as possible to the sunlight spectrum as a whole, and will output high-intensity spectral energy at wavelengths of 440nm-460nm, even exceeding the range of the blue hazard radiation curve; at the same time, it is still 460nm-480nm The wavelength has a significant absence, making the spectrum discontinuous. These existing products can only have a good fit with sunlight in the wavelength range of 500nm-620nm, so they cannot actually become "solar-like" products.

Summary of the invention

This technical solution provides a white LED lamp bead, which analyzes the high degree of fit between its spectrum and the sunlight spectrum, and maintains a degree of fit of more than 90% in the visible light range (430nm-650nm) to avoid blue light glare The problem.

The present invention is achieved through the following technical solutions.

A white light LED lamp bead, the relative spectrum of the white light LED lamp bead is Ф(λ), the relative spectrum of black body radiation corresponding to the color temperature is S(λ), and the area of Ф(λ) and S(λ) is normalized The equivalent energy spectrum Ф'(λ) of white light LED lamp beads and the equivalent energy spectrum S'(λ) of black body radiation corresponding to the color temperature are converted into the equivalent energy spectrum of white light LED lamp beads and that of black body radiation. The degree of fit R satisfies the following formula:

among them:

S'(λ)=S(λ)/k ₁

Ф'(λ)=Ф(λ)/k ₂

When λi is 380nm, λn is 680nm, R≥85%.

Further, when λi is 430 nm and λn is 650 nm, R≥90%, and more preferably, R≥95%.

Further, when λi is 465 nm and λn is 495 nm, R≥80%.

Further, the white light LED lamp bead is excited by a chip whose main emission peak is between 380 nm and 430 nm to emit phosphor powder. The phosphor has a scheme consisting of three kinds of toners or a scheme consisting of four kinds of toners. They are composed of blue powder (main emission peak at 430nm-500nm, half-peak width 20nm-100nm), green powder (main emission peak at 480nm-550nm, half-peak width 20nm-80nm) and red powder (main emission peak at 600nm-700nm, half-peak 80nm-120nm wide); or composed of blue powder (the main emission peak is 430nm-500nm, the half-value width is 20nm-100nm), green powder (the main emission peak is 480nm-550nm, the half-value width is 20nm-80nm), yellow powder (540nm- 600nm, half-peak width 60nm-120nm) and red powder (emission main peak is 600nm-700nm, half-peak width 80nm-120nm). Wherein, the blue powder is aluminate, chlorophosphate or silicate, specifically including BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , BaAl ₁₂ O ₉ :Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl:Eu ^{2 +} , Ba ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , RbNa ₃ (Li ₃ SiO ₄ ) ₄ : Eu ²⁺ or MgSr ₃ Si ₂ O ₈ : Eu ²⁺ ; the green powder is oxynitride, silicon Acid salt or aluminate, specifically including SiAlON: Eu ²⁺ , BaSiON ₂ : Eu ²⁺ , Ba ₂ SiO ₄ : Eu ²⁺ or LuAG; the yellow powder is aluminate, silicate or nitride, specifically including Ga-YAG, Sr ₂ SiO ₄ :Eu ²⁺ , (BaSr) ₂ SiO ₄ :Eu ²⁺ or La ₃ Si ₆ N ₁₁ : Ce ³⁺ ; the red powder is nitride, sulfide or fluoride, specifically including CaAlSiN ₃ : Eu ²⁺ , (Ca _1-x Sr _x )AlSiN ₃ : Eu ²⁺ , Ca ₂ Si ₅ N ₈ : Eu ²⁺ , Sr ₂ Si ₅ N ₈ : Eu ²⁺ , Ba ₂ Si ₅ N ₈ :Eu ²⁺ , CaS:Eu ²⁺ or MgGeF ₆ :Mn ⁴⁺ .

A light bar includes at least one white light LED lamp bead as described above, and a substrate for mounting and fixing the white light LED lamp bead.

The white LED lamp beads or light bars provided above can be installed in the housing of the lamp and connected with other necessary circuit elements to form the lamp.

This technical solution provides a white light LED lamp bead, which can maintain a fit degree of more than 90% in the visible light range (430nm-650nm), has a small spectral fluctuation range, excellent continuity, is closer to the sun, and can provide users Provide good lighting effects, so that indoor activities can also get a look and feel similar to outdoor.

Description of the drawings

FIG. 1 is a comparison diagram of the relative spectrum of the white LED lamp beads described in Example 1 and the relative spectrum of black body radiation corresponding to the color temperature;

2 is a comparison diagram of the relative spectrum of the white LED lamp bead described in Example 5 and the relative spectrum of black body radiation corresponding to the color temperature;

FIG. 3 is a comparison diagram of the relative spectrum of the white LED lamp beads of Example 9 and the relative spectrum of black body radiation corresponding to the color temperature.

Detailed ways

Hereinafter, the present invention will be further described in detail through specific embodiments in conjunction with the drawings. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. For those who do not indicate specific technologies or conditions in the examples, it shall be carried out in accordance with the technologies or conditions described in the literature in the field or in accordance with the product specification. The reagents or instruments used without the manufacturer's indication are all conventional products that are commercially available.

The present invention provides a white light LED lamp bead, the relative spectrum of the white light LED lamp bead is Ф(λ), the relative spectrum of black body radiation corresponding to the color temperature is S(λ), and the Ф(λ) and S(λ) The area is normalized and transformed into the iso-energy spectrum Ф'(λ) of the white light LED lamp beads and the iso-energy spectrum S'(λ) of the black body radiation corresponding to the color temperature, then the iso-energy spectrum of the white light LED lamp beads and the black body radiation are equal The fitness R of the energy spectrum satisfies the following formula:

among them:

S'(λ)=S(λ)/k ₁

Ф'(λ)=Ф(λ)/k ₂

When λi is 380nm, λn is 680nm, R≥85%.

Further, when λi is 430 nm and λn is 650 nm, R≥90%, and more preferably, R≥95%.

Further, when λi is 465 nm and λn is 495 nm, R≥80%.

Further, the white light LED lamp bead is excited by a chip whose main emission peak is between 380 nm and 430 nm to emit phosphor powder. The phosphor has a scheme consisting of three kinds of toners or a scheme consisting of four kinds of toners. They are composed of blue powder (main emission peak at 430nm-500nm, half-peak width 20nm-100nm), green powder (main emission peak at 480nm-550nm, half-peak width 20nm-80nm) and red powder (main emission peak at 600nm-700nm, half-peak 80nm-120nm wide); or composed of blue powder (main emission peak at 430nm-500nm, half-peak width 20nm-100nm), green powder (main emission peak at 480nm-550nm, half-peak width 20nm-80nm), yellow powder (main emission peak It is composed of 540nm-600nm, half-value width 60nm-120nm) and red powder (emission main peak is 600nm-700nm, half-value width 80nm-120nm). Wherein, the blue powder is aluminate, chlorophosphate or silicate, specifically including BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , BaAl ₁₂ O ₉ :Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl:Eu ^{2 +} , Ba ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , RbNa ₃ (Li ₃ SiO ₄ ) ₄ : Eu ²⁺ or MgSr ₃ Si ₂ O ₈ : Eu ²⁺ ; the green powder is oxynitride, silicon Acid salt or aluminate, specifically including SiAlON: Eu ²⁺ , BaSiON ₂ : Eu ²⁺ , Ba ₂ SiO ₄ : Eu ²⁺ or LuAG; the yellow powder is aluminate, silicate or nitride, specifically including Ga-YAG, Sr ₂ SiO ₄ :Eu ²⁺ , (BaSr) ₂ SiO ₄ :Eu ²⁺ or La ₃ Si ₆ N ₁₁ : Ce ³⁺ ; the red powder is nitride, sulfide or fluoride, specifically including CaAlSiN ₃ : Eu ²⁺ , (Ca _1-x Sr _x )AlSiN ₃ : Eu ²⁺ , Ca ₂ Si ₅ N ₈ : Eu ²⁺ , Sr ₂ Si ₅ N ₈ : Eu ²⁺ , Ba ₂ Si ₅ N ₈ :Eu ²⁺ , CaS:Eu ²⁺ or MgGeF ₆ :Mn ⁴⁺ .

A light bar includes at least one white light LED lamp bead as described above, and a substrate for mounting and fixing the white light LED lamp bead.

The white LED lamp beads or light bars provided above can be installed in the housing of the lamp and connected with other necessary circuit elements to form the lamp.

Examples 1～4

The white LED lamp beads are excited by the purple chip to emit light. The phosphor is composed of 55%-85% BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , 2%-15% SiAlON:Eu ²⁺ and 10 parts by mass. %～35% (Ca _1-x Sr _x )AlSiN ₃ :Eu ^{2+ is} mixed, the specific proportion is shown in Table 1:

Table 1

Phosphor	Component	Example 1	Example 2	Example 3	Example 4
Blue powder	BaMgAl 10 O 17 :Eu 2+	55%	65%	75%	85%
Green powder	SiAlON:Eu 2+	10%	5%	15%	2%
Red powder	(Ca 1-x Sr x )AlSiN 3 :Eu 2+	35%	30%	10%	13%

The white light LED lamp beads are prepared according to the ratio shown in Example 1. The relative spectrum Ф(λ) of the white light LED lamp beads and the relative spectrum S(λ) of the black body radiation corresponding to the color temperature are shown in Fig. 1. White light LED lamp beads no longer have high-intensity spectral energy at the wavelength of 440nm-460nm, where the spectral peak is only slightly higher than the relative spectrum of the black body radiation corresponding to the color temperature. According to the formula of the degree of fit between the iso-energy spectrum of white LED lamp beads and the iso-energy spectrum of black body radiation:

Combined with the measured data, when λi is 380nm and λn is 680nm, R=87.9%; when λi is 430nm and λn is 650nm, R=93.8%. At the same time, the characteristic interval of 465nm-495nm (that is, when λi is 465nm and λn is 495nm) can be converted to R=86.5%, which proves that the spectrum of the white LED lamp bead at the wavelength of 460nm-500nm is relatively continuous, close to the effect of natural light.

The white LED lamp beads made with the proportions shown in Example 2, Example 3, and Example 4 have a lighting effect similar to that of Example 1. Measure the relative spectra Ф(λ) of the products of each embodiment separately, combined with the fitness formula, all meet the product requirements: when λi is 380nm and λn is 680nm, R≥85%; when λi is 430nm and λn is 650nm, R≥90%; when λi is 465nm and λn is 495nm, R≥80%.

Examples 5-8

The white LED lamp bead is excited by the purple chip to emit light. The phosphor is composed of 55%-85% of M ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (M=Sr,Ba), 5% by mass. ～20% Ba ₂ SiO ₄ :Eu ²⁺ , 2%～15% Ga-YAG and 2%～10% M ₂ Si ₅ N ₈ :Eu ²⁺ (M=Ca,Sr,Ba) are mixed The specific configuration is shown in Table 2:

Table 2

Phosphor	Component	Example 5	Example 6	Example 7	Example 8
Blue powder	M 5 (PO 4 ) 3 Cl:Eu 2+ (M=Sr,Ba)	55%	65%	75%	85%
Green powder	Ba 2 SiO 4 :Eu 2+	20%	15%	5%	10%
Yellow powder	Ga-YAG	15%	12%	10%	2%
Red powder	M 2 Si 5 N 8 :Eu 2+ (M=Ca,Sr,Ba)	10%	8%	10%	3%

A white light LED lamp bead is prepared according to the proportion shown in Example 5. The relative spectrum of the white light LED lamp bead Ф(λ) and the relative spectrum S(λ) of the black body radiation corresponding to the color temperature are shown in Fig. 2. The white light LED lamp beads no longer have high-intensity spectral energy at the wavelength of 440nm-460nm, where the spectral peak is only slightly higher than the relative spectrum of black body radiation corresponding to the color temperature; while the spectrum of white light LED lamp beads at the wavelength of 460nm-500nm also becomes continuous. According to the formula of the degree of fit between the iso-energy spectrum of white LED lamp beads and the iso-energy spectrum of black body radiation:

Combined with the measured data, when λi is 380nm and λn is 680nm, R=87.8%; when λi is 430nm and λn is 650nm, R=93.8%. At the same time, the characteristic interval of 465nm-495nm (that is, when λi is 465nm and λn is 495nm) can be converted to R=83.7%, which proves that the spectrum of the white LED lamp bead is relatively continuous at the wavelength of 460nm-500nm, which is close to the effect of natural light.

The white LED lamp beads made with the proportions shown in Example 6, Example 7, and Example 8 have a lighting effect similar to that of Example 5. Measure the relative spectra Ф(λ) of the products of each embodiment separately, combined with the fitness formula, all meet the product requirements: when λi is 380nm and λn is 680nm, R≥85%; when λi is 430nm and λn is 650nm, R≥90%; when λi is 465nm and λn is 495nm, R≥80%.

Examples 9-12

The white LED lamp bead is excited by the purple chip to emit light. The phosphor is composed of 55% to 70% RbNa ₃ (Li ₃ SiO ₄ ) ₄ : Eu ²⁺ , 5% to 20% Ba _{2 in} parts by mass. SiO ₄ :Eu ²⁺ , 2%～15% La ₃ Si ₆ N ₁₁ :Ce ³⁺ and 2%～10% CaS:Eu ^{2+ are} mixed. The specific proportions are shown in Table 3:

table 3

Phosphor	Component	Example 9	Example 10	Example 11	Example 12
Blue powder	RbNa 3 (Li 3 SiO 4 ) 4 :Eu 2+	70%	65%	60%	55%
Green powder	Ba 2 SiO 4 :Eu 2+	17%	15%	20%	20%
Yellow powder	La 3 Si 6 N 11 :Ce 3+	5%	15%	10%	15%
Red powder	CaS:Eu 2+	8%	5%	10%	10%

The white LED lamp beads were prepared according to the ratio shown in Example 9. The relative spectrum Ф(λ) of the white LED lamp beads and the relative spectrum S(λ) of the black body radiation corresponding to the color temperature are compared as shown in Fig. 3. White light LED lamp beads no longer have high-intensity spectral energy at 440nm-460nm wavelength; while white LED lamp beads have a continuous spectrum at 460nm-500nm wavelength; there is no high-intensity ultraviolet spectral energy even at 410nm-420nm . According to the formula of the degree of fit between the iso-energy spectrum of white LED lamp beads and the iso-energy spectrum of black body radiation:

Combined with the measured data, when λi is 380nm and λn is 680nm, R=86.9%; when λi is 430nm and λn is 650nm, R=95.0%. At the same time, the characteristic interval of 465nm-495nm (that is, when λi is 465nm and λn is 495nm) can be converted to R=93.0%, which proves that the spectrum of the white LED lamp bead at the wavelength of 460nm-500nm is very close to the spectrum of natural light.

The white LED lamp beads made with the proportions shown in Example 10, Example 11, and Example 12 have a lighting effect similar to that of Example 9. Measure the relative spectra Ф(λ) of the products of each embodiment separately, and combine with the fitness formula to meet the product requirements: When λi is 380nm and λn is 680nm, R≥85%; when λi is 430nm and λn is 650nm, R≥90%; when λi is 465nm and λn is 495nm, R≥80%.

Claims (14)

1. A white light LED lamp bead, characterized in that the relative spectrum of the white light LED lamp bead is Ф(λ), the relative spectrum of black body radiation corresponding to the color temperature is S(λ), and the relative spectrum of Ф(λ) and S(λ) ) The area is normalized and transformed into the iso-energy spectrum Ф'(λ) of the white light LED lamp beads and the iso-energy spectrum S'(λ) of the black body radiation corresponding to the color temperature, then the iso-energy spectrum of the white light LED lamp beads and the black body radiation The degree of fit R of the isoenergy spectrum satisfies the following formula:

   

   among them:

   S'(λ)=S(λ)/k ₁

   

   Ф'(λ)=Ф(λ)/k ₂

   

   When λi is 380nm and λn is 680nm, R≥85%.
2. The white LED lamp bead according to claim 1, wherein when λi is 430nm and λn is 650nm, R≥90%.
3. The white LED lamp bead according to claim 2, wherein when λi is 430nm and λn is 650nm, R≥95%.
4. The white LED lamp bead according to claim 1, wherein when λi is 465 nm and λn is 495 nm, R≥80%.
5. The white light LED lamp bead according to any one of claims 1 to 4, wherein the white light LED lamp bead is excited by a chip with a main emission peak at 380nm-430nm to emit light, and the phosphor has a main emission peak at It is composed of blue powder with 430nm-500nm, half-peak width 20nm-100nm, green powder with main emission peak at 480nm-550nm, half-peak width 20nm-80nm, and red powder with main emission peak at 600nm-700nm and half-peak width 80nm-120nm.
6. The white LED lamp bead of claim 5, wherein the blue powder is aluminate, chlorophosphate or silicate; and the green powder is oxynitride, silicate or aluminate; The red powder is nitride, sulfide or fluoride.
7. The white light LED lamp bead according to any one of claims 1 to 4, wherein the white light LED lamp bead is excited by a chip with a main emission peak at 380nm-430nm to emit light, and the phosphor has a main emission peak at Blue powder with 430nm-500nm, FWHM 20nm-100nm, green powder with main emission peak at 480nm-550nm, FWHM 20nm-80nm, yellow powder with main emission peak at 540nm-600nm, FWHM 60nm-120nm, and main emission peak It is composed of red powder with a half-peak width of 80nm-120nm at 600nm-700nm.
8. The white LED lamp bead according to claim 7, wherein the blue powder is aluminate, chlorophosphate or silicate; the green powder is oxynitride, silicate or aluminate; The yellow powder is aluminate, silicate or nitride; the red powder is nitride, sulfide or fluoride.
9. The white LED lamp beads of claim 6 or 8, wherein the blue powder is BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , BaAl ₁₂ O ₉ :Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , Ba ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , RbNa ₃ (Li ₃ SiO ₄ ) ₄ : Eu ²⁺ or MgSr ₃ Si ₂ O ₈ : Eu ²⁺ .
10. The white LED lamp bead according to claim 6 or 8, wherein the green powder is SiAlON: Eu ²⁺ , BaSiON ₂ : Eu ²⁺ , Ba ₂ SiO ₄ : Eu ²⁺ or LuAG.
11. The white LED lamp bead according to claim 8, wherein the yellow powder is Ga-YAG, Sr ₂ SiO ₄ :Eu ²⁺ , (BaSr) ₂ SiO ₄ :Eu ²⁺ or La ₃ Si ₆ N ₁₁ :Ce ³⁺ .
12. The white LED lamp beads of claim 6 or 8, wherein the red powder is CaAlSiN ₃ :Eu ²⁺ , (Ca _1-x Sr _x )AlSiN ₃ :Eu ²⁺ , Ca ₂ Si ₅ N ₈ :Eu ²⁺ , Sr ₂ Si ₅ N ₈ :Eu ²⁺ , Ba ₂ Si ₅ N ₈ :Eu ²⁺ , CaS:Eu ²⁺ or MgGeF ₆ :Mn ⁴⁺ .
13. A light bar comprising a substrate, characterized in that: at least one white LED lamp bead according to claim 1 is provided on the substrate.
14. A lamp comprising a housing, characterized in that the white LED lamp bead according to claim 1 or the light bar according to claim 13 is installed in the housing.

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